Controller gain scheduling for mass flow controllers

Details Controller gain scheduling for mass flow controllers Controller gain scheduling for mass flow controllers

2006-12-07

2011-12-20

Hepperle, Stephen M (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C700S282000

Reexamination Certificate

active

08079383

ABSTRACT:
A mass flow controller having a feedback controller gain, comprises: a sensor configured so as to sense the flow of fluid through controller; a valve arranged so as to adjust the flow of fluid through the controller; and a processor configured so as to control the valve as a function of the flow of fluid sensed by the sensor. The sensor and valve are arranged within a feedback system, and the processor updates the feedback controller gain in real time based on the ratio of at least one calibration gas parameter to at least one operating gas parameter, such that the closed loop transfer function of the feedback system remains substantially constant regardless of operating conditions so as to have a consistent control performance at different operation conditions from the calibration condition.

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